Toner for electrostatic image development

Abstract

A toner for electrostatic image development includes toner particles containing a binder resin including an amorphous resin and a crystalline resin, a dye, and a release agent. The percentage of the crystalline resin on the surface of the toner particles as measured by X-ray photoelectron spectroscopy is 15% or less.

What is claimed is: 
     
         1 . A toner for electrostatic image development, comprising:
 toner particles containing a binder resin including an amorphous resin and a crystalline resin, a dye, and a release agent,   wherein the percentage of the crystalline resin on the surface of the toner particles as measured by X-ray photoelectron spectroscopy is 15% or less.   
     
     
         2 . The toner for electrostatic image development according to  claim 1 , wherein the percentage of the crystalline resin on the surface of the toner particles as measured by X-ray photoelectron spectroscopy is from 1% to 8% inclusive. 
     
     
         3 . The toner for electrostatic image development according to  claim 2 , wherein the percentage of the crystalline resin on the surface of the toner particles as measured by X-ray photoelectron spectroscopy is from 3% to 5% inclusive. 
     
     
         4 . The toner for electrostatic image development according to  claim 1 , wherein the dye is a basic dye. 
     
     
         5 . The toner for electrostatic image development according to  claim 4 , wherein the basic dye is at least one selected from rhodamine-based dyes having a cationic group and azo-based dyes having a cationic group. 
     
     
         6 . The toner for electrostatic image development according to  claim 1 , wherein the content of the release agent with respect to the mass of the toner particles is from 5.0% by mass to 10.0% by mass inclusive, and
 wherein the percentage of the release agent on the surface of the toner particles as measured by X-ray photoelectron spectroscopy is from 3% to 15% inclusive.   
     
     
         7 . The toner for electrostatic image development according to  claim 1 , wherein the crystalline resin has a melting temperature Tm of from 60° C. to 80° C. inclusive. 
     
     
         8 . The toner for electrostatic image development according to  claim 1 , wherein the amorphous resin has a glass transition temperature Tg of from 45° C. to 60° C. inclusive. 
     
     
         9 . The toner for electrostatic image development according to  claim 1 , wherein the binder resin includes, as the amorphous resin, a urea-modified polyester resin. 
     
     
         10 . The toner for electrostatic image development according to  claim 1 , wherein the content of the crystalline resin with respect to the mass of the toner particles is from 1% by mass to 12% by mass inclusive. 
     
     
         11 . The toner for electrostatic image development according to  claim 1 , wherein the content of the dye with respect to the mass of the crystalline resin is from 5% by mass to 40% by mass inclusive. 
     
     
         12 . A toner for electrostatic image development, comprising:
 toner particles containing a binder resin including an amorphous resin and a crystalline resin, a dye, and a release agent,   wherein the ratio of the percentage of the crystalline resin on the surface of the toner particles as measured by X-ray photoelectron spectroscopy to the percentage of the amorphous resin on the surface of the toner particles as measured by X-ray photoelectron spectroscopy is 20% or less, and   wherein the ratio of the percentage of the crystalline resin on the surface of the toner particles as measured by X-ray photoelectron spectroscopy to the percentage of the release agent on the surface of the toner particles as measured by X-ray photoelectron spectroscopy is 200% or less.   
     
     
         13 . A toner for electrostatic image development, comprising:
 toner particles containing a binder resin including an amorphous resin and a crystalline resin, a dye, and a release agent,   wherein the formula: 10≤Qc1/Qc2 is satisfied,   where Qc1 (J/g) is the amount of heat absorbed that is determined based on an endothermic peak derived from the crystalline resin in a first heating process in differential scanning calorimetry measurement, and Qc2 (J/g) is the amount of heat absorbed that is determined based on an endothermic peak derived from the crystalline resin in a second heating process in the differential scanning calorimetry measurement.